Strain Sensor Fixing Device for Torque Sensors
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Solution Overview
Problem
Existing methods for fixing strain sensors to torque sensors, such as welding, adhesives, and screws, either lead to performance degradation, incomplete force transmission, or result in larger device configurations due to the need for high-strength pressing members and increased stiffness, making it difficult to achieve downsizing and thinning of the torque sensor.
Innovation Solution
A strain sensor fixing device using a fixing member with a first side, a second side parallel to the first side, and a face with an opening, where the face is positioned off-center, allowing for line contact with the strain body, and a screw is inserted through the opening to secure the strain sensor to the structure, providing enhanced fixation without thermal deformation and maintaining sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to fix the strain sensor to the structure, then strong fixation is achieved, but thermal deformation occurs and sensor performance deteriorates
Solution Approach 1:
The pressing member serves as an intermediary component between the fixing member and the strain body. It transmits the clamping force from the fixing member to the strain body without direct thermal contact, thereby achieving strong fixation while avoiding thermal deformation that would occur with welding.
2Object-affected harmful factors
If adhesive is used to fix the strain sensor to the structure, then no thermal deformation occurs, but fixation strength is insufficient and sensor sensitivity deteriorates
Solution Approach 1:
The fixing system is segmented into multiple functional components: the fixing member (screw), the pressing member (intermediary), and the strain body. This segmentation allows the adhesive to be used only between the pressing member and strain body for positioning, while the primary fixation strength comes from the mechanical clamping action of the fixing member, thus avoiding the weakness of adhesive-only fixation.
3Strength
If screws and pressing members are used to fix the strain sensor, then fixation strength is improved, but device size increases and downsizing becomes difficult
Solution Approach 1:
The fixing member and pressing member are merged into a integrated fixing device assembly that is compactly designed. The pressing member is positioned between the fixing member and strain body in a space-efficient manner, allowing strong fixation to be achieved without significantly increasing the overall device volume, thus enabling downsizing compared to traditional separate component arrangements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution securely fixes the strain sensor, enhances fixation pressure, prevents sensor performance deterioration, and allows for downsized torque sensor configurations by ensuring direct force transmission and reducing the need for additional components, thus improving sensor performance and reducing the device's size.
Implementation Method 1
screw to be inserted into the opening and to be screwed into the first structure
Implementation Method 2
the second side is brought into line contact with an end part of a strain body
Data Source
AI summary
A fixing member includes a first side, second side parallel to the first side, and face provided between the first side and second side and including an opening. The face is provided at a position separate from a line connecting between the first side and second side, first side is brought into line contact or point contact with the first structure, and second side is brought into line contact with an end part of a strain body constituting a strain sensor, the end part being provided on the first structure. A screw is inserted into the opening and is screwed into the first structure.